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DL/T 5789-2019: Technical guidelines for construction of insulated tubular busbar
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Technical guidelines for construction of insulated tubular busbar
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DL/T 5789-2019
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Basic data | Standard ID | DL/T 5789-2019 (DL/T5789-2019) | | Description (Translated English) | Technical guidelines for construction of insulated tubular busbar | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | P60 | | Classification of International Standard | 29.240.20 | | Word Count Estimation | 44,498 | | Date of Issue | 2019-06-04 | | Date of Implementation | 2019-10-01 | | Quoted Standard | GB 50149; GB 50150; GB 26164; DL/T 5293; DL/T 1658 | | Regulation (derived from) | Natural Resources Department Announcement No. 7 of 2019 | | Issuing agency(ies) | National Energy Administration | | Summary | This standard applies to the construction and acceptance of insulated tubular busbars with AC 35kV and below. The construction and acceptance of insulated tubular busbars shall not only comply with this standard, but shall also comply with the current relevant national standards. | DL/T 5789-2019: Technical guidelines for construction of insulated tubular busbar---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Technical guidelines for construction of insulated tubular busbar
ICS 29.240.20
P 60
Record number. 63143-2018
People's Republic of China Electric Power Industry Standard
P DL/T 5789-2019
Guidelines for Construction Technology of Insulated Tubular Bus
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Foreword
This standard is based on the National Energy Administration's National Energy Technology (2015) No. 283, "The National Energy Administration issued the.2015 energy sector industry
The requirements of the "Notice of the Standard System (Revision) Plan" were conducted by Guangxi Transmission and Transformation Construction Co., Ltd. together with relevant units after extensive investigation and research.
Research, carefully summarize the construction technology and construction experience of my country’s insulated tubular bus, refer to the current national standards,
Based on this standard.
This guideline is divided into 7 chapters and 2 appendices. The main contents include. general rules, terminology, basic regulations, construction preparation, busbar installation,
Test, project handover and acceptance, etc.
This standard is managed by the China Electricity Council.
This standard is under the jurisdiction and interpretation of the Electrical Engineering Construction and Commissioning Standardization Committee of the Power Industry.
An accessory connected to electrical equipment at the end of a solid-insulated tubular bus system.
3 Basic regulations
3.0.1 The insulated tubular busbar products used should comply with the current national standard "35kV and below solid insulated tubular busbar" DL/T 1658
And other relevant standards and product technical documents, and should have qualified certificates.
3.0.2 Fasteners for the installation of insulated tubular busbars and accessories shall be made of hot-dip galvanized products that meet the current national standards, or equivalent to hot-dip galvanized products.
Products with galvanized properties.
3.0.3 After the insulated tubular bus and accessories arrive at the site, they should be inspected and accepted, and fire-proof and moisture-proof measures should be taken during storage.
3.0.4 In the process of loading, unloading, handling and hoisting the insulated tubular bus, the lifting points should be set according to the product technical documents.
3.0.5 Safety technical measures shall be formulated for the construction of insulated tubular bus bars, and the construction shall meet the requirements of the design and product technical documents.
3.0.6 The fixing fittings and wall metal sealing plate of the insulated tubular bus bar shall not form a closed magnetic circuit around the single-phase bus bar, and shall be connected to the grounding grid
Reliable connection, metal components should be treated with anti-corrosion.
3.0.7 The metal shielding layer of the insulated tubular bus should be reliably grounded.
3.0.8 The hand-over test shall be carried out on the insulated tubular busbar after installation according to the requirements of the "test" part of this guideline.
4 Construction preparation
4.0.1 Check the type and specification of insulated tubular busbar, the quantity of accessories, brackets, etc., certificate of conformity, factory test report, etc. according to the packing list.
The product technical documents should be complete, and the appearance of the insulated tubular bus should not be damaged, scratched, or deformed.
4.0.2 Technical clarifications should be made to the construction personnel before construction. The construction personnel should be familiar with the busbar structure, and be proficient in the
Work Safety Regulations" GB 26164, have corresponding operating skills, and should be familiar with the construction environment and connection methods of the bus line
formula.
4.0.3 The equipment to be connected to the insulated tubular bus should be installed.
4.0.4 For high-altitude operations, a working platform that meets safety requirements should be set up in advance, and construction personnel should properly equip and use safety protection equipment.
4.0.5 To work in a live area, work tickets should be processed in advance, and safety isolation measures should be taken according to the requirements of the operation department. Enter you special
For construction in places with special requirements, it is still necessary to understand and abide by the relevant regulations of special management requirements.
4.0.6 The tools and tools should be prepared according to the requirements of the construction site; the performance and condition of the tools and tools should be good.
4.0.7 According to the design drawings and product technical documents, the relevant departments shall conduct on-site re-testing of the foundation, embedded parts, and pillars, and measure the absolute
The level and center deviation of the edge bus pillar.
5 Bus installation
5.1 General provisions
5.1.1 The laying path of insulated tubular busbars shall be connected to water, heating, oil, gas and other pipelines, roads, buildings and other live installations.
The minimum clear distance of construction shall meet the design requirements.
5.1.2 The main bus, branch bus, down conductor and equipment connection line of the same arrangement of insulated tubular bus should be symmetrical and consistent, horizontal and vertical.
Neat and beautiful; the bending degree of the bending part of the bus bar should be consistent.
5.1.3 The installation of insulated tubular bus should take temperature compensation measures according to the design requirements.
5.1.4 When the insulated tubular busbar is connected to the equipment terminal and between the busbar sections, the overlapping surface should be silver-plated or tin-lined; copper and aluminum
When connecting, copper-aluminum transition measures should be adopted.
5.1.5 The phase sequence arrangement of the insulated tubular bus bar shall meet the design requirements and match the phase sequence arrangement of the main bus bar of the electrical equipment.
5.1.6 Insulated tubular busbars should be marked with color at both ends of the busbar, busbar branches, busbar transposition, etc. Three-phase AC bus identification color
Should be. A phase yellow, B phase green, C phase red.
5.1.7 The fittings, intermediate joints and terminal connectors and materials of the insulated tubular bus bar shall be supplied by the manufacturer, and shall be qualified
The number, model, specification, and voltage level of the certificate and installation manual should meet the requirements of the product technical documentation. Intermediate joint and end
Auxiliary materials required for end production shall meet the requirements of product technical documents.
5.1.8 The insulation connection structure of the insulated tubular busbar intermediate joint should be the same or similar to the insulation structure of the busbar body, that is, it should include insulation
The insulation strength of the insulation layer, insulation shielding layer, metal shielding layer and protective layer shall not be lower than that of the busbar body, and shall meet the requirements of waterproof
Tide performance requirements.
5.1.9 The metal shielding layer of the insulated tubular bus bar shall be divided into sections according to the requirements of the product technical documents, and each section shall be grounded at a single point. The ground wire should pass
The support shall be grounded, and shall not be grounded through the busbar fixing hardware.
5.1.10 The safe clear distance of the open terminal of the insulated tubular bus bar shall meet the current national standard "Bus Bar Installation of Electrical Installation Engineering"
Installation construction and acceptance specification" GB 50149 regulations.
5.2 Production and installation of bus support and hanger
5.2.1 The processing of insulated tubular bus supports and hangers shall meet the following requirements.
1) The materials, specifications and anti-corrosion measures of the supports and hangers should meet the design requirements.
2) The parts of the support and hanger should be straight without obvious distortion, the allowable deviation of the blanking is 2mm, and the cut should be free of curling and burrs.
3) The support and hanger should be welded firmly, without obvious deformation, and the allowable deviation from the design is 2mm.
4) The hole diameter and hole distance of the busbar fixing hardware installed on the support and hanger should meet the design requirements.
5.2.2 Before installing the insulated tubular busbar support and hanger, the actual size of the installation part should be checked and checked.
5.2.3 The insulated tubular busbar support and hanger should be installed firmly, and the fixing method, elevation and span of the support should meet the design requirements.
5.2.4 When the insulated tubular bus bar passes through the wall or floor, wall partitions should be provided, and the wall partitions should be made of non-magnetic materials or insulating partitions.
The wall partition should be installed firmly, and the waterproof treatment of the gap between the partition and the wall should meet the design requirements.
5.2.5 Non-live metal components such as busbar supports, hangers, wall partitions, etc. should be reliably grounded, and the size of the grounding down conductor should meet the design requirements.
5.3 Installation of busbar fixing hardware
5.3.1 The insulating tube-type busbar fixing hardware should be made of non-magnetic materials, and the specifications of the hardware should match the busbar system. Busbar fittings and bolts are strong
The length should meet the design requirements, and the length of the bolt should show 2 to 3 bolts of the nut.
5.3.2 The installation positions of fixed fittings, sliding fittings and telescopic fittings supporting insulated tubular busbars shall meet the design requirements.
5.3.3 Before the installation of the busbar fittings, the size of the contact parts between the fittings and the busbar conductor should be measured, and the error value should conform to the product technology
Document requirements. The surface of the fittings should be smooth and flat, and there should be no cracks, slag inclusions, flashes, burrs or scars.
5.3.4 The busbar fittings should be installed smoothly and firmly on the support and hanger, and the bolt tightening torque should meet the requirements of the product technical documents.
5.4 Installation of insulated tubular bus
5.4.1 Before installing the insulated tubular bus, check that the installation position and relative dimensions of the bus and its connecting equipment meet the design requirements.
5.4.2 The layout and positioning of the components of the insulated tubular bus bar shall meet the requirements of the design and product technical documents. Before putting in place, deal with the outer sheath of the busbar
The surface and the surface of the fittings should be inspected and cleaned, and the surface should be smooth and free of scars.
5.4.3 Multi-point hoisting should be adopted for the installation of insulated tubular busbars, and the protective measures for the outer sheath of the busbar at the hoisting points should conform to the design and product technical specifications.
Piece requirements. Hoisting busbars should use slings with protective jackets, and traction and guiding measures should be taken to avoid collisions or scratches on the busbar outer protection
set.
5.4.4 After the insulated tubular busbar is installed in place, the axis size and levelness of each section of the busbar should be adjusted to meet the requirements of the product technical documents. mother
After the line system is installed, the busbar fittings should be adjusted so that the supported busbar shall not be subject to additional stress.
5.4.5 In addition to the above requirements, the installation of insulated tubular busbars in trenches, shafts, cable interlayers, etc. should also meet the following requirements.
1 Before the busbar is installed, all other work items that may damage the busbar device in subsequent construction should be completed.
2 Before the busbar is installed, check that the drainage in the trench and shaft is smooth, and the waterproof performance of related structures should meet the design requirements.
3 After the busbar is installed, fire separation should be carried out according to the design requirements.
4 After the busbar is installed, the busbar warning signs should be set according to the design requirements. When there is no requirement in the design, it should be every 15m~
Obvious high-voltage warning signs shall be set up at 30m, turning places and entering buildings (structures).
5.4.6 If it is found that the outer sheath of the busbar is damaged during the installation of the busbar, a professional technician should repair it according to the requirements of the product technical documents.
Or return to the factory for repair.
5.5 Installation of busbar intermediate joint, expansion section and grounding
5.5.1 Operators should meet the following requirements.
1 Familiar with the bus structure.
2 Familiar with the installation method of the intermediate joint, expansion section and grounding, as well as the process flow and quality requirements.
3 Strictly construct in accordance with the drawings, installation instructions and work instructions.
4 Welders should have corresponding qualifications.
5.5.2 The operating environment and pre-installation inspection shall meet the following requirements.
1 There should be no dust or fugitive dust in the air of the workplace, and no work should be carried out on rainy days without protective measures. The ambient temperature and humidity should meet
Product technical document requirements; measures such as windproof, rainproof, snowproof, antifreeze and fireproof measures should be taken at the welding site.
2 Intermediate joints should be set in the straight section of the bus bar, not at the turning part.
3 Check that the type, specification and quantity of connectors, prefabricated insulating pipes, etc. meet the requirements of the packing list, and should match the connecting bus.
4 Visual inspection should be carried out on intermediate joints, expansion sections, prefabricated insulating pipes and other components, connections and coating materials, and there should be no damp, dirty
Contamination, damage, deterioration and deformation; the appearance of the conductor connection parts should be intact, and there should be no abnormal phenomena such as rust and deformation; the connection contact surface should be clean
Clean, free from damage and scratches.
5 The surface of the bus conductor and the inner hole surface of the connecting fittings should be treated. The end should be flat and free of sharp corners.
The surface should be clean, dry, free of rust, oil and dust.
5.5.3 The installation procedures and craftsmanship of the intermediate joint, expansion section and grounding shall meet the requirements of product technical documents.
5.5.4 The installation of each intermediate joint, telescopic section and grounding shall be completed continuously at one time without interruption.
5.5.5 The treatment of the related overlapping contact surfaces between the busbar sections and the conductor connection between the expansion joints shall comply with the current national standard "Electrical Installation
The relevant regulations of "Code for Construction and Acceptance of Installation Engineering Bus Device" GB 50149.
5.5.6 The insulation strength of any insulation structure adopted at the intermediate joint shall not be lower than the busbar body.
5.5.7 When using the "Ω" type expansion section, the bending radius should meet the design requirements, and the surface of the bending part should be normal and normal before connection.
There is no distortion, wrinkles and cracks, and it is not allowed to force the "Ω" type expansion section to bear additional stress when connecting.
5.5.8 The welding process should meet the following requirements.
1 Before welding, the tubular bus bars of each phase should be in the same horizontal plane, and the distance between the bus bars and the ground should meet the design requirements.
2 The welding part should be grooved. The groove should be smooth, uniform and free of burrs. The area of 50mm on both sides of the groove should be cleaned.
No dust, oxide film, moisture and oil stains.
3 Welding equipment and welding materials should match the material of the welded bus bar, and argon arc welding should be used for aluminum and aluminum alloy bus bar welding.
4 The welding process should meet the requirements of product technical documents. Each tube type bus bar welding test sample should be tested, after the test is qualified
Only then can the formal welding of the busbar be carried out.
5 When welding, the two sections of tubular busbars should be located on the same axis, and the gap between the ports should be in the range of 2mm～3mm.
The welding seam position should be matched reasonably. After welding, the welding seam position of each phase of the tubular bus bar should be the same. The welding seam should be arc-shaped, smooth, and free of burrs.
Slag inclusion, pores, cracks, lack of fusion, lack of penetration, etc.
6 After welding, the residual welding slag on the bus bar should be removed.
5.5.9 The coating process of the wrapping joint should meet the following requirements.
1 Coating conductor shielding layer, insulating layer, insulating shielding layer, metal shielding layer or coating built-in insulating layer, capacitive shielding layer, shielding layer
The prefabricated intermediate joint insulation sleeve process shall meet the requirements of product technical documents.
2 The stress of the wrapping operation is uniform, and there must be no uneven thickness of the wrapping layer. The wrapping layer should be tight and flat.
The thickness should meet the requirements of the product technical documentation.
3 During the coating process, there must be no defects such as impurities, micropores, protrusions and delamination of the semi-conductive layer, and residual air inside the insulating layer.
4 When heat-shrinking insulated pipes, the busbar insulation layer and insulation shielding layer should be cleaned, and it should be ensured that the insulated pipes are properly contracted and insulated.
All the internal air is exhausted.
5 The wrapping waterproof tape and insulating shielding layer should be round and tight, the width of the metal shielding layer overlapped on both sides, and the waterproof adhesive
The width of the overlapping metal shielding layer on the belt shall meet the requirements of the product technical documents.
6 When the copper shielding tape layer is used to wrap the package, the coverage rate of the copper tape layer should meet the requirements of the product technical documents. When there is no requirement, the copper
The coverage rate of the tape layer should not be less than 15% of the width of the copper tape, and the copper tape shall not be wound to form wrinkles and shall not damage the semi-conductive shield layer.
7 When wrapping the stress control glue and heat shrinkable stress control tube, ensure that the junction of the insulating shielding layer and the solid insulating layer is filled and leveled, and
The circumferential overlap should be even, and the ports should be neat.
8 When applying silicone oil during the coating process, the amount of silicone oil should be controlled strictly according to the requirements of the product technical documents. The application of silicone oil should be even and
Appropriate amount and should have good consistency.
9 The heat shrinkable tube shall not be used as the main insulation layer instead of the main insulation coating material.
10 The overlap between the outer sheath of the intermediate joint and the busbar body section should be sealed and axially water-blocking measures.
5.5.10 The bus conductor connection should meet the following requirements.
1 The butt connection device used for tubular bus connection should match the connected bus, and no closed ferromagnetic loop should be formed around the bus.
road.
2 Before the bus conductor is connected, its surface and the inner and outer surfaces of the connector should be clean and dry.
3 The cross-section and radial dimensions of the connecting pipe and the busbar conductor should match. When using the crimping connection method, the crimping mold and the outer diameter of the connecting pipe
The size should match; when bolts are used for connection, the bolt tightening torque should conform to the current national standard "Busbar device construction of electrical installations
And Acceptance Specifications" GB 50149 related regulations and product technical document requirements; conductive rods are used between the busbar sections to connect with threaded fastening
When connecting, the threads should be tightened in place, and the conductive rods should be in good electrical contact with the bus bars at both ends.
4 After the busbar conductor is connected, the busbar should be stable, the connection should be firm and reliable, and the surface dirt, dust, and metal powder should be cleaned and dried.
net.
5 After the bus conductor is connected, the conductor connection contact resistance should be tested in time. The contact resistance value should meet the requirements of the product technical documents.
When there is no requirement, the contact resistance value of the conductor connection should not be greater than the DC resistance value of the equal-length bus conductor.
5.5.11 The installation of protective layer shall meet the following requirements.
1 Before the sheath is fixed, it should be ensured that the inside of the sheath port at both ends of the joint is clean and dry, and the protection should be carried out according to the requirements of the product technical documents.
Layer fixed.
2 After the protective layer is positioned, it should be evenly heated around to shrink it in place.
3 The sealing at both ends of the protective layer should meet the requirements of the product technical documentation.
5.5.12 Grounding shall meet the following requirements.
1 The grounding capacitive screen and metal shielding layer of the insulated tubular bus system shall be grounded according to the requirements of the design and product technical documents. When not necessary
When required, it can be insulated in sections, and each section should be grounded at a single point. When the grounding screen of each busbar section is connected in series via the intermediate connecting sleeve or connecting piece
When connecting, the grounding screen of each busbar section should be led out at both ends, and the continuity test of the whole busbar grounding screen loop should be carried out after the assembly is completed.
2 The grounding wire of the horizontally arranged busbar section should be led out from the bottom of the busbar. When the grounding wire of the vertically arranged busbar section is led out from the side of the busbar,
The upper part of the lead-out location of the grounding wire should be covered with an insulated umbrella skirt, and the lead-out portion of the grounding wire should be put into water and moisture.
3 When the tubular bus has a metal outer protective layer, the metal outer protective layer shall be reliably grounded according to the design requirements, and multi-point grounding shall not be formed.
4 The production and installation of the grounding lead wire should meet the requirements of the product technical documents, and the grounding wire section and grounding method should meet the design requirements.
And the connection with the ground network should not be less than two points.
5.6 Installation of bus terminal
5.6.1 The bus terminal should be a finished terminal that has been assembled with the terminal section bus body in the manufacturer.
5.6.2 Before installing the terminal section of the busbar, check that its model and specifications should meet the design requirements, and should be visually inspected, and there should be no dirt or rust.
Traces, damage and deformation.
5.6.3 The end of the bus bar should be rounded, and the connection surface of the end should be silver-plated or tin enamel.
5.6.4 Except for plug-in bus terminals, copper soft connections should be used between the bus terminals a...
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